public class Date {
    public int year;
    public int month;
    public int day;

    public Date(int year,int month,int day){
//        打印int 的默认值0
        System.out.println(this.year);
        System.out.println(this.month);
        System.out.println(this.day);
    }

    public static void main(String[] args) {
        Date d = new Date(2023,6,6);
    }
}
